The flames that Joan released were flames that were filled with divine energy.
The corruption energy, or rather the destruction energy, was the energy of the God of Destruction that opposed the order that the rest of the gods pursued.
In a sense, the divine energy was the mortal enemy of the destruction energy.
So it wasn't strange that the divine energy would search for the destruction energy to purify it.
That meant that if the flames that were filled with divine energy were heading for this certain staircase…it would mean that there was a larger amount of corruption energy that was down here compared to the other sets of stairs.
It meant that the Relic of Destruction was most likely at the bottom of the stairs.
Well, it wouldn't be right at the bottom of the stairs, but these stairs most likely led the way to the Relic of Destruction.
In that case, this was the path that we needed to take.
